Core-removing machine for hollow-drill steel



Feb, '16 ,1926.

1,573,070 A. D. JOHNSON ET AL com: REMOVING MACHINE FOR HOLLOW DRILL STEEL Filed Nov. 9, 1923 //v/ /v TOR5 A. a JOHNSON. f H. 5 C H U L Z 1: 5mm;

Patented Feb. 16, 1926..

UNITED STATE.

PATENT OFFICE.

ARTHUR DORMAN JOHNSON AND FREDERICK AUGUST SCHULZE, or WELLAND. 01v- TARIO, CANADA, ASSIGNORS TO ATLAS ALLOY STEEL KIRK, new YORK, a conronarron or new YORK.

CORE-REMOVING- MACHINE Application filed. November To all whom it may concern;

Be it known that we, ARTHUR DORMAN Jormsoiv and FREDERICK AUGUST Soiiutzn, both citizens of the United States of Amer- :ica, and both residents of the town of Welland, in the county of Welland, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Core- Removing Machines for Hollow-Drill Steel, of which the following is the specification.

Our invention relates to core removing machines for hollow drill steel, and the object of the invention is to devise a simple means for removing the sand core from hollow steel such as that which is used for rock drill purposes and it consists essentially of means for rotating the hollow steel around its longitudinal axis, means bearing against the end of the sand core for dislodging the sand core, means for forcing the dislodging means longitudinally through the steel as the dislodging operation proceeds, and means for simultaneouslyremoving the dislodged core by fluid means, as hereinafter more particularly explained the following specification. I

Fig. 1 is a side elevation of our machine broken away intermediately of its length.

Fig. 2 is an enlarged sectional detail the main operating parts.

In the drawings like characters ofre'ference indicate corresponding parts in the different views. y

1 indicates a main base. 2 and 3 are supplemental bases hingedly connected to the main base at 4 and 5. 6 and 7are two bearing standards mounted upon the main base centrally thereof. 8 is a bushing sleeve journalled freely in the bearing ends of the standards 6 and 7 and held therein by end enlargements 9 and 10. 11 is a pulley which is secured centrally upon the bushing sleeve 8 and held centrally between the standards 6 and 7 by spacing collars 12 and 13. 14 is a piece of hollow steel such as is used for rock drill purposes and containing the sand core 15. The hollow steel 14 is formed with flatffacea'that is to say, in octagonal or similar form, the bushing sleeve 8 being provided with correspondingly formed orifices into which the steel 14 fits. The pulley 11 is driven by suitable means and therefore when driven, revolves the steel 14 about its axis.

of I FOR HOLLOW-DRILL sweat.-

a, 1923. serial no. 673,791;

17 and 18 are supplemental standards in which are rotat-ably held bushings 19 having centre orifices corresponding in shape to the outer contour of the steel 14, thereby tormoo-nronarioiv, or DUN ing a bearing support for the ends of the steel within the bearing portions of the supplemental standards 17 and 18. The bushings 19 are held in 20 and 21.

e will now describe the means bywhich the core is removed, such means being supported upon the bases 2 and 3. The mechanisms which are supported by the bases 2. and 3 are identical in character and-we will position by end collars therefore describe only one of these mechanisins.

22 is a standard supported upon the upper end 0t which is suitably mounted a T pipe 23." 24 is a tube secured at one end in the inner end of the horizontal or main arm of ing secured in the lower end of the elbow 26 and in which is secured a depending pipe 28. 29 is a depending pipe secured at its upper end in the depending arm of the LT 23. 30 is an elbow secured at the lower end of the" pipe 29. elbows 30 and 30*. The pipe 31 is, preferably divided into two portions connected together at their adjacent ends by a valve casing 32. 33 is a fluid supply pipe provided with a fluid inlet 34 secured inthe opening 35 oi the casing 32. 36 is a fluid outlet. provided with an outlet opening 37 extending from the casing opening 38 located at the opposite end of the casing 32 to the opening 35. V

39 is a rocking shaft extending through the. casing 32 provided with an operating handle 39 upon which is supported a valve disc 40 which assumes the diagonal positions indicated by tall and dotted lines in Fig. 2. '41 is a small tube extending longitudinally of the tube 24 and extending intermediatcly of its length through a plug 42 secured in the inner end of the, main arm 31 is a pipe connecting the of the T 23. i The plug 42 is provided with a suitable bushing 43 through which the tube 41 extends. The inner end of the tube 41 is provided with a piston head 44 which op the outer end of the piston 44.

about its axis. The supplemental bases 2 and 3 are then swung into position so that the tubes 41 are in axial longitudinal alignment with the centre of the steel 14. Steam or other fluid is then admitted through the pipe 33 into the valve casing 32 and is directed by the valve which is in the t'nll position shown in Figure 2, into the pipe 31, passing through such pipe into the elbow 30*, pipe 28, elbow 26 into the tube 24 against By this means the piston 44 and the tube 41 is carried against the end of the sand core- 15, the steel 14 being revolved as above de scribed. A grinding action is produced betweenthe inner end of the tube 41 and the sand core so that the sand core is gradually dislodged. After the dislodging operatlo-n takes place the steam or other fluid passes through the centre of the tube 41 against the inner end of the sand core and passes through the crevices formed between the 'inner end of the tube 41 and the dislodged particles of the core so as to gradually wash these particles from the end of'the core and carry them outward between the tube 41 and the steel-14.

This operation continuesfroin each end of the steel 14 until the tubes 41 meet in the centre of the steel. lVhen this operation is completed the valve 40 is swungover into the dotted position, directing the steam or otherfluidintothe elbow 30, pipe 29', sleeve '23 against the opposite side of the piston 44 so as to withdraw the tube 41 out of the steel. lVhen the operation is complete the supplemental bases 2 and 3 areswung to one side so as to permit of the withdrawal of the steel 14 and the insertion of a new steel.

From this description it will be seen that we have devised a very simple device where bythe sand cores of hollow stee'l such as that used in rock drills is quickly and easily removed. It may be stated that in order to "form the hollow steel above described, a

steel billet or ingot is drilled or cast, giving a tubular or hollow form. The centre or hole is then filled with special sand or other suitable substance after which the billet or ingot is heated to a suitable temperature and worked or-rolled down to the desired size or section.

The machine hereinbeftore described is forthepurposeo'f removing this sand core.

hat we claim as our invention is 1. A core removing machine comprising a support for holding a hollow steel having a sand core'and in whichsuch steel is rotatably mounted; means for, rotating the hollow steel; means for bearing against the end of the core for dislodging the same, means for supplying fluid for carrying such dislodging means longitudinally of the hollow steel and for simultaneously removing the dislodged particles as they are loosened from the core. I

2. In a core removing machine, the combination with means for revolving hollow steel containing a core axially of a tube, a piston contained within the tube, an inner tube mounted within the aforesaid tube and adapted to hear at its inner end against the end of the said core, and means for supplying i'luid for forcing the piston and inner tube longitudinally against the core adapted to pass through such inner tube to remove the particles of the core as they are loosened.

3. In a core removing machine, the combination with means for revolving the hollow steel containing a core around its longitudinal axis. of a main tube mounted to assume a position in longitudinal alignment with the centre of the sand core and having closed ends, an inner tube adapted to move longitudinally through the inner closed end of the main tube, a piston longitudinally movable within the main tube and secured to the outer end of the inner tube, and a valve for controlling the admission of fluid to either one side or the other of the piston.

4. In a core removing machine, the combination with means for revolving the hollow steel containing a core around its longi tudinal axisJof a main tube mounted o cate with each end of the main tube, and a discivalve located within the valve casing adapted to assume oppositely disposed diagonal positions across the. valve casing so as to direct the fluid to either one end or the other of the main tube.

5. The combination of a cylinder, a plunger in said cylinder, a liquid projecting tube connected with said plunger and extending from one end of said plunger out of said cylinder and adapted to receive liquid from the other end of said'plunger and means for supplying liquid under pressure to said cylinder to act on said plunger and to supply liquid to said projecting tube.

6. In a machine for removing cores, of hollow rods, the combination of a cylinder,

a plunger in said cylinder, a liquid projecting tube secured at one end to said plunger, the other end of said tube being adapted to pass out of said cylinder, and a gland on said cylinder having a bore through which said tube is adapted to pass, said gland having means for guiding said tube to said bore.

7. In a machine for removing cores of hollow rods, the combination of ameans for supporting a rod, liquid projecting tubes 10 adapted to enter the opposite ends of the rod to project jets of liquid at the core, and means actuated by the pressure of the liquid supplied to said tubes for advancing said tubes into said rod as the coreis removed 15 

